git.sesse.net Git - nageru/blob - nageru/lrameter.cpp

   1 #include "lrameter.h"
   2
   3 #include <QPaintDevice>
   4 #include <QPainter>
   5 #include <QPalette>
   6 #include <QPen>
   7 #include <QPixmap>
   8 #include <QRect>
   9 #include <QWidget>
  10 #include <math.h>
  11 #include <mutex>
  12
  13 #include "vu_common.h"
  14
  15 class QPaintEvent;
  16 class QResizeEvent;
  17
  18 using namespace std;
  19
  20 LRAMeter::LRAMeter(QWidget *parent)
  21         : QWidget(parent)
  22 {
  23 }
  24
  25 void LRAMeter::resizeEvent(QResizeEvent *event)
  26 {
  27         recalculate_pixmaps();
  28 }
  29
  30 void LRAMeter::paintEvent(QPaintEvent *event)
  31 {
  32         QPainter painter(this);
  33
  34         float level_lufs;
  35         float range_low_lufs;
  36         float range_high_lufs;
  37         {
  38                 lock_guard<mutex> lock(level_mutex);
  39                 level_lufs = this->level_lufs;
  40                 range_low_lufs = this->range_low_lufs;
  41                 range_high_lufs = this->range_high_lufs;
  42         }
  43
  44         float level_lu = level_lufs - ref_level_lufs;
  45         float range_low_lu = range_low_lufs - ref_level_lufs;
  46         float range_high_lu = range_high_lufs - ref_level_lufs;
  47         int range_low_pos = lrint(lufs_to_pos(range_low_lu, height()));
  48         int range_high_pos = lrint(lufs_to_pos(range_high_lu, height()));
  49
  50         QRect top_off_rect(0, 0, width(), range_high_pos);
  51         QRect on_rect(0, range_high_pos, width(), range_low_pos - range_high_pos);
  52         QRect bottom_off_rect(0, range_low_pos, width(), height() - range_low_pos);
  53
  54         painter.drawPixmap(top_off_rect, off_pixmap, top_off_rect);
  55         painter.drawPixmap(on_rect, on_pixmap, on_rect);
  56         painter.drawPixmap(bottom_off_rect, off_pixmap, bottom_off_rect);
  57
  58         // Draw the target area (+/-1 LU is allowed EBU range).
  59         // It turns green when we're within.
  60         int min_y = lrint(lufs_to_pos(1.0f, height()));
  61         int max_y = lrint(lufs_to_pos(-1.0f, height()));
  62
  63         // FIXME: This outlining isn't so pretty.
  64         {
  65                 QPen pen(Qt::black);
  66                 pen.setWidth(5);
  67                 painter.setPen(pen);
  68                 painter.drawRect(2, min_y, width() - 5, max_y - min_y);
  69         }
  70         {
  71                 QPen pen;
  72                 if (level_lu >= -1.0f && level_lu <= 1.0f) {
  73                         pen.setColor(Qt::green);
  74                 } else {
  75                         pen.setColor(Qt::red);
  76                 }
  77                 pen.setWidth(3);
  78                 painter.setPen(pen);
  79                 painter.drawRect(2, min_y, width() - 5, max_y - min_y);
  80         }
  81
  82         // Draw the integrated loudness meter, in the same color as the target area.
  83         int y = lrint(lufs_to_pos(level_lu, height()));
  84         {
  85                 QPen pen(Qt::black);
  86                 pen.setWidth(5);
  87                 painter.setPen(pen);
  88                 painter.drawRect(2, y, width() - 5, 1);
  89         }
  90         {
  91                 QPen pen;
  92                 if (level_lu >= -1.0f && level_lu <= 1.0f) {
  93                         pen.setColor(Qt::green);
  94                 } else {
  95                         pen.setColor(Qt::red);
  96                 }
  97                 pen.setWidth(3);
  98                 painter.setPen(pen);
  99                 painter.drawRect(2, y, width() - 5, 1);
 100         }
 101 }
 102
 103 void LRAMeter::recalculate_pixmaps()
 104 {
 105         const int margin = 5;
 106
 107         on_pixmap = QPixmap(width(), height());
 108         QPainter on_painter(&on_pixmap);
 109         on_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
 110         draw_vu_meter(on_painter, width(), height(), margin, 2.0, true, min_level, max_level, /*flip=*/false);
 111
 112         off_pixmap = QPixmap(width(), height());
 113         QPainter off_painter(&off_pixmap);
 114         off_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
 115         draw_vu_meter(off_painter, width(), height(), margin, 2.0, false, min_level, max_level, /*flip=*/false);
 116 }